Bump serde_json from 1.0.122 to 1.0.124 #5515

Job	Run time
Check	32s
test (beta)	1m 36s
test_all_features	13m 34s
test (stable)	1m 39s
test (windows)	3m 32s
test (macos)	1m 23s
Check if cbindgen runs cleanly for generating the C headers	8m 35s
coverage	10m 4s
Lints (beta)	32s
Lints (stable)	36s
minimum_rust_version	7m 56s
Publish (dry-run)	8m 27s
Run tests under wasm32-wasi	1m 21s
Check if wasm-pack builds a valid package for the sourmash crate	1m 28s
	1h 1m 15s

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